/Engine/Source/Runtime/Engine/Classes/GameFramework/RootMotionSource.h
Helper function for accumulating override velocity into InOutVelocity
void AccumulateOverrideRootMotionVelocity ( float DeltaTime, const [ACharacter](API\Runtime\Engine\GameFramework\ACharacter) & Character, const [UCharacterMovementComponent](API\Runtime\Engine\GameFramework\UCharacterMovementComponent) & MoveComponent, FVector & InOutVelocity ) const